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Troubleshooting Uni-T EEPROM ErrE

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  • DanFen
    Badcaps Veteran
    • Apr 2017
    • 201
    • Malta

    Troubleshooting Uni-T EEPROM ErrE

    I've got a UT139C that powers on for a second with an ErrE, before switching itself back off.

    I haven't found much information about this, other then the error being caused by the EEPROM (both on the internet and from fellow members here). While I'm using a cheaper multimeter temporarily, I'm trying to troubleshoot this... hoping it won't go to trash

    I've opened it up and did a visual inspection. Unfortunately I couldn't see anything obvious, everything looks clean and as new. No signs of damaged components.

    I'm attaching two photos: one of the eeprom area, and the other I think are the rails on the back that end up to the eeprom (?). Also attaching datasheets.

    And because I'm doing this to learn, and I'm still new to this, I have a couple questions.

    1. What are the components starting with L? I know C are usually caps, while R are resistors, F fuses and so on.
    2. Laugh at me, but, where do you find ground on these 2 layer boards? On laptops it's easy cause these are usually screw holes/ports etc.... What am I missing?

    Thanks a lot
    Attached Files
    Last edited by DanFen; 01-06-2022, 05:12 PM.
  • lotas
    Badcaps Veteran
    • Jan 2016
    • 2538
    • Russia

    #2
    Re: Troubleshooting Uni-T EEPROM ErrE

    Look here
    https://www.eevblog.com/forum/testge...matics-avail)/

    Comment

    • stj
      stj
      Great Sage 齊天大聖
      • Dec 2009
      • 29505
      • some shithole run by Israeli agents

      #3
      Re: Troubleshooting Uni-T EEPROM ErrE

      L are inductors.

      do you have an eeprom programmer?

      Comment

      • DanFen
        Badcaps Veteran
        • Apr 2017
        • 201
        • Malta

        #4
        Re: Troubleshooting Uni-T EEPROM ErrE

        Thanks, will go through it.
        Hello again! Not yet, but on delivery. Went for the RT809F.
        Originally posted by stj View Post
        L are inductors.

        do you have an eeprom programmer?

        Comment

        • lotas
          Badcaps Veteran
          • Jan 2016
          • 2538
          • Russia

          #5
          Re: Troubleshooting Uni-T EEPROM ErrE

          Here are two original and modified firmwares for UT139C.
          Attached Files

          Comment

          • stj
            stj
            Great Sage 齊天大聖
            • Dec 2009
            • 29505
            • some shithole run by Israeli agents

            #6
            Re: Troubleshooting Uni-T EEPROM ErrE

            backup the original first, it has calibration data in it

            Comment

            • DanFen
              Badcaps Veteran
              • Apr 2017
              • 201
              • Malta

              #7
              Re: Troubleshooting Uni-T EEPROM ErrE

              I know it's been a while, but I just got to do this now. Wrote the shared bin to the IC, re-soldered it back, and still getting the same error :/

              I also de-soldered the IC and read it again just to make sure that it got programmed correctly. Then compared it to the shared hex and they are the same... which concludes that the programming was fine.
              Last edited by DanFen; 07-16-2022, 02:51 PM.

              Comment

              • redwire
                Badcaps Veteran
                • Dec 2010
                • 3413
                • Canada

                #8
                Re: Troubleshooting Uni-T EEPROM ErrE

                Post the EEPROM file you have, to see if it can be fixed.

                Comment

                • DanFen
                  Badcaps Veteran
                  • Apr 2017
                  • 201
                  • Malta

                  #9
                  Re: Troubleshooting Uni-T EEPROM ErrE

                  This is the backup (the one I had before I wrote the shared one).
                  Attached Files

                  Comment

                  • stj
                    stj
                    Great Sage 齊天大聖
                    • Dec 2009
                    • 29505
                    • some shithole run by Israeli agents

                    #10
                    Re: Troubleshooting Uni-T EEPROM ErrE

                    check the tracks between the eeprom and the main chip.
                    here is a schematic of another meter with the same chipset,
                    and a datasheet with example schem on page 17
                    Attached Files

                    Comment

                    • DanFen
                      Badcaps Veteran
                      • Apr 2017
                      • 201
                      • Malta

                      #11
                      Re: Troubleshooting Uni-T EEPROM ErrE

                      Will try Is that done with the EEPROM back in circuit?

                      Originally posted by stj View Post
                      check the tracks between the eeprom and the main chip.
                      here is a schematic of another meter with the same chipset,
                      and a datasheet with example schem on page 17

                      Comment

                      • redwire
                        Badcaps Veteran
                        • Dec 2010
                        • 3413
                        • Canada

                        #12
                        Re: Troubleshooting Uni-T EEPROM ErrE

                        I looked at your EEPROM dump with a hex editor and did not see any errors. I can't know what every byte should be, but I did not see anything corrupt.
                        Check the EEPROM pullup resistors on SDA and SCL are OK, is R29 soldered on both sides? The main IC DTM0660 looks like solder balls are behind/under the pins?

                        Comment

                        • DanFen
                          Badcaps Veteran
                          • Apr 2017
                          • 201
                          • Malta

                          #13
                          Re: Troubleshooting Uni-T EEPROM ErrE

                          Thanks for checking!

                          All resistors seem to be soldered fine, but I'll re-flow them just in case. I also measured them and the readings are good.

                          About the solder balls, do you mean in between pins? If so, it doesn't seem like it under the microscope, and I didn't reflow it or touch it in any way.

                          I also tested in continuity between the DTM0660 and the EEPROM IC, in case there's a broken trace, but all seems fine.

                          Originally posted by redwire View Post
                          I looked at your EEPROM dump with a hex editor and did not see any errors. I can't know what every byte should be, but I did not see anything corrupt.
                          Check the EEPROM pullup resistors on SDA and SCL are OK, is R29 soldered on both sides? The main IC DTM0660 looks like solder balls are behind/under the pins?

                          Comment

                          • redwire
                            Badcaps Veteran
                            • Dec 2010
                            • 3413
                            • Canada

                            #14
                            Re: Troubleshooting Uni-T EEPROM ErrE

                            No, the solder bridges I see are UNDER the pins.
                            You can poke a wire or paper clip (gently) through and see if you hit them. Usually they are solder balls from extra paste and can poke out.
                            Attached Files

                            Comment

                            • DanFen
                              Badcaps Veteran
                              • Apr 2017
                              • 201
                              • Malta

                              #15
                              Re: Troubleshooting Uni-T EEPROM ErrE

                              Doesn't seem to be the case, must be the quality of the previous photo

                              I'm still to re-flow the resistors around the EEPROM area.

                              Originally posted by redwire View Post
                              No, the solder bridges I see are UNDER the pins.
                              You can poke a wire or paper clip (gently) through and see if you hit them. Usually they are solder balls from extra paste and can poke out.
                              Attached Files

                              Comment

                              • DanFen
                                Badcaps Veteran
                                • Apr 2017
                                • 201
                                • Malta

                                #16
                                Re: Troubleshooting Uni-T EEPROM ErrE

                                Reflowed the resistors, still the same. While it seems to be interesting, I don't think it's worth working on it anymore. The only thing I miss about this is that it has auto range, and the other ones I have do not.

                                Comment

                                • stj
                                  stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 29505
                                  • some shithole run by Israeli agents

                                  #17
                                  Re: Troubleshooting Uni-T EEPROM ErrE

                                  did you check the eeprom is getting power?

                                  Comment

                                  • redwire
                                    Badcaps Veteran
                                    • Dec 2010
                                    • 3413
                                    • Canada

                                    #18
                                    Re: Troubleshooting Uni-T EEPROM ErrE

                                    For some reason EEPROM power has a R40 100Ω resistor to +V, and it's supposed to have a bypass cap 0.1uF across power and gnd but I don't see it.

                                    Comment

                                    • CapLeaker
                                      Leaking Member
                                      • Dec 2014
                                      • 6358
                                      • Canada

                                      #19
                                      Re: Troubleshooting Uni-T EEPROM ErrE

                                      Check with an oscilloscope the data line, clock and the main oscillator for activity.

                                      Comment

                                      • junphil
                                        New Member
                                        • Sep 2023
                                        • 1
                                        • Philippines

                                        #20
                                        Re: Troubleshooting Uni-T EEPROM ErrE

                                        Please help....

                                        Does anyone here have the working and original firmware of ut139???

                                        Comment

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